Dark-count-less x-ray photon counting using an LSO-MPPC detector and its application to computed tomography

Eiichi Sato; Yasuyuki Oda; Hajime Kodama; Osahiko Hagiwara; Hiroshi Matsukiyo; Akihiro Osawa; Toshiyuki Enomoto; Manabu Watanabe; Shinya Kusachi; Shigehiro Sato; Akira Ogawa

doi:10.1117/12.2025358

26 September 2013 Dark-count-less x-ray photon counting using an LSO-MPPC detector and its application to computed tomography

Eiichi Sato, Yasuyuki Oda, Hajime Kodama, Osahiko Hagiwara, Hiroshi Matsukiyo, Akihiro Osawa, Toshiyuki Enomoto, Manabu Watanabe, Shinya Kusachi, Shigehiro Sato, Akira Ogawa

Author Affiliations +

Proceedings Volume 8853, Medical Applications of Radiation Detectors III; 885302 (2013) https://doi.org/10.1117/12.2025358
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

X-ray photons are detected using an Lu₂(SiO₄)O [LSO] single-crystal scintillator with a decay time of 40 ns and a multipixel photon counter (MPPC). The photocurrent from the MPPC is amplified by a high-speed current-voltage amplifier with an 80 MHz-gain-band operational amplifier, and the 200-ns-width event pulses are sent to a multichannel analyzer to measure X-ray spectra. The MPPC is driven in the pre-Geiger mode at a bias voltage of 70.7 V and a temperature of 23°C. Photon-counting computed tomography (PC-CT) is accomplished by repeated linear scans and rotations of an object, and projection curves of the object are obtained by linear scanning. The exposure time for obtaining a tomogram was 10 min with scan steps of 0.5 mm and rotation steps of 1.0°. At a tube voltage of 100 kV, the maximum count rate was 350 kcps/pixel. We carried out PC-CT using gadolinium media and confirmed the energydispersive effect with changes in the lower level voltage of event pulses using a comparator.

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Eiichi Sato, Yasuyuki Oda, Hajime Kodama, Osahiko Hagiwara, Hiroshi Matsukiyo, Akihiro Osawa, Toshiyuki Enomoto, Manabu Watanabe, Shinya Kusachi, Shigehiro Sato, and Akira Ogawa "Dark-count-less x-ray photon counting using an LSO-MPPC detector and its application to computed tomography", Proc. SPIE 8853, Medical Applications of Radiation Detectors III, 885302 (26 September 2013); https://doi.org/10.1117/12.2025358

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